Some Observations on Influenza Hemagglutination Inhibitor of Allantoic Fluid

Summary

Treatment of the hemagglutination inhibitor from allantoic fluid with 90% phenol did not result in a low molecular weight active substance. After acetone precipitation, adsorption on indicator virus and ultrafiltration, the partially purified inhibitor was active at 0.5 p.g and the active principle had a sedimentation constant of 15.